1. American Petroleum Institute Research Project 44 1974
2. Andreev, P. F., Transformation of Petroleum in Nature: CH6 (1968).
3. Bestougoff, M. A., Fundamental Aspects of Petroleum Geochemistry: 84 (1967).
4. BROOKS, B.T., EVIDENCE OF CATALYTIC ACTION IN PETROLEUM FORMATION, INDUSTRIAL AND ENGINEERING CHEMISTRY 44: 2570 (1952).
5. BYRAMJEE, R.J., OIL AND GAS JOURNAL 78: 78 (1983).